Cylindrical slide valve



Jan. 9, 1923. l 1,441,508.

A. M. 1ENSEN' ET AL.

CYLINDRICAL SLIDE VALVE.

FILED DEC. 6,1921. 2 SHEETS-SHEET l Jan. 9, 192. 1,441,508. A. M. JENSEN ET AE.

CYLINDRXCAL SLIDE VALVE.

FILED DEc.6, i921. zsHEETs-SHEET 2.

Patented Jan. 9, 1923. y

Lintec,

'- Unirse .stares rarest"- orifice.

ANfrjoN lMemos JENSEN AND KNUE rErEEsEN EngiENnsrnUr, or COPENEAGEN, y DENMARK.

Application iiled December' 6, 192i. Serial No. 520,373.

To all whom 'it may concern.'

Be' it known that we, ANTON MfinrUsf JENsoN, mechanical engineer, and KNUD PirrEnsEN BnlnNnsTRUr, manager, subjects oi the King of Denmark, residing at vlryngbyvej 93A, Copenhagen, and .Nordre Fasanvej 90, Copenhagen, Denmark, have invented certain new and useful Improvements in Cylindrical Slide Valves, ofwhichthe ollowing is a specification.

This invention relates l to a cylindrical slide-valve for vacuum pumps, compressors, and other piston machines having two cylinders, the pistons of which are reciproca-ted by cranks displaced 180 from each other.

ln suchl machines it is well known to use a common cylindrical slide-valve,` which is reciprocated in a slide-valve boX situated between the cylinders andwhich simultane-` ously opens 'the admission to one cylinder and exhausts from the otherv cylinder.

lin the known cylindrical slide-valves of this kind, the admission andthe exhaust channels of the slide-valve or the channels from thecylinders to the valve box, orfboth sets of channels, are curvilinear and consequently have a great length. rlhe result therefore is that the medium distributed by' the slide-valve is throttled through these channels and meets with a great deal of,

resistance. If the channels of the slide- `valve are curvilinear, the slide-valveis dit icult to manufacture, and the stroke of the slide-valve must be long. lf the channels of the cylinders are curvilinear, the clearances.

of the cylinders are increased, whereby the efficiency of the engine is reduced.

The present invention :has for its object to remove these drawbacks.

According to theinventionl this is obtained by dividing the chamber of the slide-valve into sectionsv by means of horseshoeshaped ribs and by partitions, in such anianner, that its admission channel forgany one of the cylinder'ends is in the same plane at right vangles to the axis of the slide-valve as its exhaust channel for the adjacent end of the other cylinders.

The result is hereby obtained that the slide-valve stroke is reduced to a minimum, and that the admission channels and exhaust channels of the slide-valve as well as the channels between the cylinders and the slide-valve become rectilinear with a minif valve` al'on fr `two single-acting cylinders with a y mum ci length, thatvthe `manufacture of the cylinders and the slide-valve boX is ren-i dered very inexpensive. i in' the accompanying drawings like numerals show correspondingparts-throughout Fig. l a longitudinal section'through" two double-acting cylinders having a common slide-valve,

FigQ is a longitudinal'section through' the slide-valve,`

h.. rig. 3 is a crossesection through the slidevalve along the line B B in F ig. l,

Fig. 4 is' a cross-section through a `slideig the line C-C in Fig l,y o is a cross-section through the slide- Fig. G is a cross-section through Fig. 7 is a longitudinal section through f common cylindrical slide-valve, and' y Fig. 8 is a longitudinal section through the slide-valve accordingr to Fig. 7.

l and the two working cylinders, and 3 and 4 are their pistons. 5 is aslide-valve bon arrangedbetween the cylinders l and 2,

and 6 is a cylindrical slide-valve located in 'i said' box.y i and 7 are channels, interconnecting the cylinder l and the slide-valveL box 5, and 8 and 8 are channels interconnecting the cylinder 2 and the said boX. 9

and 9 are admission channels leading from the box"5 to the channels 7 and 7, respectively, and 1G and l0 are admission channels leading from the box 5 to the channels Sand 8', respectively.y The channels 9 and l()v are interconnected throughy anupwardly open chamber Q() in the upper end of the slide-valve 6, while the ports 9 and 10y are interconnected through a downwardlyv open chamber 20 in the lower end of the slidevalve.r` vThe said two chambers 20 and 20 formadmission chambers,y which are sepa-r ratedtrom a centralexhaust chamber in the slide-valve by means of partitions 19 and 2l, and 19 and 2l', respectively. 1l and l2, and 1l and l2 are the exhaust channels of the slide-valve from, the channels 7 and 8, and 7 and 8, respectively. The channels 11 and l2 are connected through suitable channels 17, Fig. 8, with the exhaust chamber 23, and the channels 1l and l2 arc connected with the exhaust chamber 23 by means of similar channels 17', Fig. 6. 13, .Fig 1, is a cover on the slide-valve box, and 1a and 11 are the admission channels of the saine.

15 is the exhaust channel from the exhaust 'chamberu23 in the 4slide-valve. 16 Fig. 2, is an opening arranged opposite the channel 15 inl order to balance the slidevalve. 18 and 18', Figs. 3 and' 6, and' 19 and 19', Figs. a and 5, are horsesho,e-torinedV rihs, or partitions, which divide the cha-mbers 20and 20' of the slide-valve in such a Ina-mier, that the admission channels 9 and 9' into the cylinder 1 may be arranged in one` and the,A same horizontal plane as the exhaust channels 12 and 12 for the cylinv der 2, and so that the exhaust channels 11 and 11. tor. the cylinder 1. may be arranged in one andi the same horizontal plane as the admission shannels 10 and 10", respectively, for the other cylinder 2. The valve-rod 27 may be connected with the slide-valve by means ogt a head 2.8 or in any other suitable manner and isengaged by an eccentric, not shown,.the center line of. which forms 90O with the center line of either of the two Cranks- The operation of the machine is as follows:

Suppose that the two pistons of the machine, .which for instance represents a vacuum pumphave just finished their movement in the directions ot the arrows 24 and 25, respectively, and; reached their dead centers as shown, whereby further operation will cause airrto be sucked into the cylinder 1 through channels 7 and 9, chamber 20, and admission channel 141, while air is being compressed at the other side ot the piston 3, whereby the said air is discharged through4 channels 7' and 11', channel 17', exhaust chamber 23, and exhaust channel 15. At the underside of the piston 4 air was simultaneously sucked in through channel 8', admission channely 10', chamber 20 and admission 'channel 14, and air was compressed over the upper face oi? the piston 1, which air is exhausted through channel 8, exhaust channel 12,` channel 17, exhaust chamber 23 and exhaust channel 15.

Then the pistons 8 and t move 'from the position shown in Fig. 1 in the opposite directions as indicated hyl the arrows 24:, 25, respectively, the exhaust channels 11 and 12' of the slide-valve will open for the compressed air from the upper` end ot the cylinder 1 and from the lower end oi the cylinder 2. respectively, while the admission channels 10 and 9' will open for the admission of air to the upper end of the cylinder 2 and toV the lower end ofthe cylinder 3, respectively. The said channels 11 and 12', and 10. and 9' willr not interrupt the admission to and the exhaustion from the said end of said cylinders, until the pistons have reached their opposite dead centers.

The construction shown in Figs. 7-8 differs only from the construction shown in Figs. 1-6 that the pistons 1 andA 2 and there- Jr'oije theA slide-valve G are single-acting.

The construction according to Figs. 7 and 8 does not show the chamber 20', and the cylinders 1 rand 2 as well as the slide box arey open at their lower ends. The slidevaive acts in a manner similar to the working operation of the slide-valve according to the construction shown in Figs. 1-6.

lfieclaim kas our invention:

1,. A. pump comprising two cylinders having rectilinear openings at each end; a double-acting piston in each cylinder-adapted. to mutually reciprocate in said cylinders; a slide-valve box for said pistons mounted-,between said cylinders; andl a circular slidevalve adaptedV to reciprocate in said slide- Valve box, said slide-valve having. a plural- `ity oi rectilinear. admission and exhaust channels at each end thereof', a. central exhaust chamber, admission chambers at each end thereoifand horseshoe-shaped partitions in said admission chambers enclosing exhaust channels to said exhaust chamber.

2. A cylindrical slide-valve for two cylin- 'ders having a central exhaust chamber having an exhaust channel at each end` thereof and onthe saine side; an admission chamber at each end or". said valve having two admis.- sion channels at opposite sides of said chamber; andy a horseshoe-shape $l partition forming anexhaust channel in each of said admission chambers, being in communication, with said exhaust chamber' and. at opposite.

sides oi saidexhaust channels.

ln: testimony whereorwe aiiix our signatures. f y

AmoriA iviAsiUs inistr.' mum i BETER/SEN snmiips'riiur.

Witnesses i CARL MnMMiNosnN, HENRIK WoLrr. 

